Piiilipp cramer



(No Model.)

P. GRAMER. VALVE FOR STEAM WINGHES.

No. 463,140. Patented Nov. 17, 189 1.

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UNITED, STATES PATENT OFFICE.

PHILIPP CRAMER, OF MONTREAL, CANADA.

VALVE FOR STEAM-WINCHES.

SPECIFICATION forming part of Letters Patent No. 463,140, dated November17, 1891.

Application filed June 23, 1890. Serial No. 356,491. (No model.)

To all whom it may concern:

Be it known that LPHILIPP CRAMER, a citizen of the Kingdom of Bavaria,having made my first declaration to become acitizen of the UnitedStates, residing at Montreal, in the Dominion of Canada, have inventedcertain Improvements in Valves for Steam-finches of the Kind which areorked by One Steam- Oylinder Only, of which the following is aspecification.

Exhauststeam throttling has heretofore been applied for braking orretarding the action of a piston in the cylinders of hoisting-engines. Asteam-winch embodying my complete invention includes, in combinationwith an exhaust-pipe and throttle-valve, a cylinder provided with valvesand valveports so organized that the engine-crank can freely pass itscenters under the back pull of a load, as when lowering, because thesaid valves and exhaust-ports are constructed and organized inaccordance with another portion of my invention,which includes, incombination with a steam-cylinder, two sets of steam and exhaust portsupon the valve-seat and two valves, the exhaust-cavities of which arelonger than usual, and the positions of which are controlled by aright-and-left screw upon the valve-rod in a manner that turning orrotating the rod will change the relative positions of valves and ports.The object of this part of my invention is to enable lowering with thewinch without the use of an expensive friction-clutch or additionalbrake-band. I attain this favorable result by appropriately varyingtherelative positions of the two slidevalves, and thereby placing both endsof the cylinder into variable communication because of the variableclosure of the ports of the valves, thus dispersing the pressure of acushion and allowing the crank to pass the centers of its travel freelywhen under back pull from the load.

In the drawings, Figure 1 is a side elevation of a steam-winch embodyingmy inven vention. Fig. 2 is a plan of the same. Figs. 3 and 4; are plansof the parts of my machine, which illustrate the action in the steamchest.

Similar lettersrefertosimilarparts throughout the several views.

A is the frame of the winch, of which one side is sulficientlylengthened to receive the engine;

B is the drum; C, the big gear-wheel; D, the pinion; E, the crank-shaft;F, the crankwheel 5 G, the piston; H, the piston-rod; I, theconnecting-rod; K, the cylinder; L, the steam-chest; M, the eccentric;N, the eccentric-rod; O, the valve-rod; P P, the valves; Q the right andR the left screw upon the oppositely-threaded rotative Valve-rod; S, thegeneral exhaust; U, thevalve controlling the general exhaust, which,acting under counterweight upon its lever, is supposed to keep theexhaust automatically open, as shown in Fig. l.

In Fig. 2 the valves are shown in their natural central position forforward motion.

In Fig. 3 the valves are drawn apart in their central position so as tobring each steam-port into communication with its exhaust-port, and theexhaust-ports afterward running into one general exhaust communicationexists between both ends of the cylinder, preventing a cushion, whichwould prevent the crank passing a center of its travel. The crank,therefore, can give way to the back pull of the load, or, in short, onecan lower with the winch without use of friction or brake.

In Fig. 4 the piston has passed the end of its oscillation and moves inthe same direction as the valves, of which one, however, has stopped thefree communication between the cylinder ends, and thus cushions will beformed between the centers of the cranktravel to prevent a too freemotion of the piston, and as the strength of these cushions can becontrolled by adjusting the valves less or more apart the lowering,also, can be controlled.

What I claim, and desire to secure by Letters Patent, is*

1. In a steam-winch, the combination, with the steam-cylinder, of twoconnected exhaustports, an exhaust-throttle valve controlled by a lever,and a pair of valves which co-operate with said exhaust-ports and areconnected by a readily rotative valve-rod provided with anoppositely-threaded screw for promptly varying the positions of saidvalves With relation to each other and to valve-rod, and are adapted tobe variably opsaid exhaust-ports, as and for the purposes erated by therotation of said rod, substan- 1o specified. tially as and for thepurposes specified.

2. The combination, with the cylinder of a 5 steam-winch, of twoconnected exhaust-ports PHILIPP CRAMER.

and two valves which are provided with WVitnesses: lengthenedexhztustcavities, are coupled to- CHAS. L. KNAPP, get-her by areversely-sorew-threaded rotative O, GORMAN.

